2– Imam Ali (AS), in the description of prophets (AS) and saints, said, ‘Allah has examined them with enemies, and has tried them with struggles, and has tested them with fears.’
[Nahj al-Balagha, Sermon 192]

8– Imam Ali (AS) said, ‘Test our followers
[shi`aa] with three things: at times of prayer and how well they observe them, secrets and how they guard them from our enemies, and their wealth and how they aid their brothers with it.’
[al-Khisal, p. 103, no. 62]